1ZFS

Solution structure of S100A1 bound to calcium

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	4D_13C-separated_NOESY	0.5-3 mM S100A1 monomer, U-15N, 13C, 0.35 mM NaN3, 15 mM NaCl, 20 mM CaCl2, 25 mM Tris, 25 mM DTT, 10% D2O	90% H2O/10% D2O	15 mM	7.2	ambient	310
2	4D_13C/15N-separated_NOESY	0.5-3 mM S100A1 monomer, U-15N, 13C, 0.35 mM NaN3, 15 mM NaCl, 20 mM CaCl2, 25 mM Tris, 25 mM DTT, 10% D2O	90% H2O/10% D2O	15 mM	7.2	ambient	310
3	3D_15N-separated_NOESY	0.5-3 mM S100A1 monomer, U-15N, 13C, 0.35 mM NaN3, 15 mM NaCl, 20 mM CaCl2, 25 mM Tris, 25 mM DTT, 10% D2O	90% H2O/10% D2O	15 mM	7.2	ambient	310
4	HNHA	0.5-3 mM S100A1 monomer, U-15N, 13C, 0.35 mM NaN3, 15 mM NaCl, 20 mM CaCl2, 25 mM Tris, 25 mM DTT, 10% D2O	90% H2O/10% D2O	15 mM	7.2	ambient	310

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	600
2	Bruker	AVANCE	800

NMR Refinement
Method	Details	Software
distance geometry simulated annealing (DGSA)		X-PLOR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	200
Conformers Submitted Total Number	19
Representative Model	1 (closest to the average)

Additional NMR Experimental Information
Details	RDC data using radially and axially compressed acrylamide gels were added into structure calculations. H-bonds were determined using hydrogen exchange experiments

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	X-PLOR	2.9.3	C.D. Schwieters, J.J. Kuszewski, N. Tjandra, G.M. Clore
2	refinement	X-PLOR	2.9.3	C.D. Schwieters, J.J. Kuszewski, N. Tjandra, G.M. Clore